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If you are using Windows Server 2k3 then its easy to implement the
group policy on any ou. First, you have to create a OU then create
a user on that OU. That way we apply all the policy on that OU.
Same thing in Windows Server 2k8

The network path not found error in the group policy is usually caused if the domain server is not properly registered in dns server.
Run netdiag /fix on the dc/dc's which will fix the dns registrations.